Granulocytic sarcoma, histology
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Granulocytic sarcoma is an extramedullary proliferation of neoplastic hematopoietic cells. It can show various stages of maturation. In this slide, there is a mononuclear cell infiltrate composed of fairly undifferentiated cells. Admixed eosinophilic myelocytes are present, which are often a histologic clue to the diagnosis of granulocytic sarcoma.